<template>
  <!-- 头部部分 -->
  <header class="header">
    <h1>todos</h1>
    <input v-model.trim="name" @keyup.enter="add" class="new-todo" placeholder="请输入任务名称" autofocus />
  </header>
</template>

<script>
export default {
  data () {
    return {
      name: ''
    }
  },
  methods: {
    add() {
      if(this.name === '') return alert('内容不能为空！')
      this.$emit('add-event',this.name)
      this.name = ''
    }
  }
}
</script>

<style></style>
